Hi everyone! I'm not sure what happened in the video, but I said that TEM and SEM have the same resolution, when in fact they certainly don't! SEM has a resolution of 20nm whilst TEM has a resolution of 0.1nm (higher resolution). :)
00:23 = Definition of magnification and resolution 01:13= Optical (light) microscopes 03:14 = Transmission electron microscopes (TEM) 04:21= Limitations of electron microscopes 05:35= Scanning electron microscopes (SEM) 6:48 = How to calculate magnification 11:16= The eyepiece graticule 13:40= Cell ultracentrifugation 16:51= Exam questions and mark schemes
Thank you so much for this! I’m a mature student teaching myself and have just found your channel, I’m absolutely ecstatic! This is such a great help x
hello, what about how to observe the position of starch grains in the cells when using an optical (light) microscope. I dont think it was mentioned in the video? can someone please help?
Also when talking about tissue fluid, should you say the blood plasma is forced out of the arterial end into the tissue fluid or that blood is forced with small molecules within such as water?
Hi! You would just say that high hydrostatic pressure causes molecules such as fatty acids, ions, amino acids, glucose, water etc to be forced out of the blood plasma/capillary at the arterial end, and this forms tissue fluid :)
Not for the exam, but it's a part of the practical endorsement, so I thought I'd mention it! (even I went looking for this but this is what she said to a previous comment :) )
Hi! That is the length of the scale bar (measured with a ruler) , which allows you to figure out how many times the scale bar fits into the image, thus allowing you to calculate the actual length of the cell :)
@@AlevelBiologyHelp no i know this :P im actually studying for a test tomorrow (first 2 chapters AS Bio), what i meant to ask was which software do you use , by the way really appreciate the effort youre making its hard to get detailed topics on specific courses ive been looking for a channel like this since long and i hope yours achieves great success
